Siemens DB-3S Smoke Detector Base

Siemens DB-3S from Siemens Fire Safety is a low-profile surface-mounting base also used on Siemens ionization detectors. Furthermore, each Siemens DB-3S base utilizes screw-clamp terminals for all electrical connections, self-wiping contacts for reliability, and contains a provision for an optional, concealed locking mechanism that prevents unauthorized removal of the detector head.

This detector base is commonly used on the following Siemens – Fire Safety fire alarm control panels: TXR-320, System 3, and SXL. Model DB-3S UL 1481, ULC Listed, as well as Factory Mutual (FM) and California State Fire Marshals’ (CSFM), Approved. Besides, the detector is provided with a separate base which attaches to a standard 4 inch square, 4 inch octagonal, or single gang electrical box, with the box size and depth required by the NEC for the number and the size conductors used

Mounting – Using the DB-3S

1. Route all wires outward from the outlet box
2. When the ALARM LED viewing is critical, position the LED mark in the base in the intended direction
3. Mount base to the outlet box and route wires through the hole in the center of the base. Make connections directly to the base terminals.
4. After all, bases are installed, including the end of the line device, check loop continuity. To make possible the continuity check, a jumper is furnish in every bas to complete the loop. An open circuit condition exists until the jumper or detector is install in the base.
5. If loop continuity is acceptable, remove the jumper at each base and proceed with detector head installation
6. To ensure proper installation of the detector head into the base:

• Properly dress all wires
• Position all wires flat against the base
• Take up all slack in the outlet box
• Route wires away from connector terminals